Scrim

A scrim is essentially a large piece of translucent fabric stretched in a frame or hung freely. Place it between sun (or flash) and subject and the hard light becomes soft. The difference with a softbox is scale: scrims go from 60x60 cm for product work to 3x6 meters (and bigger, including 6x6 meter butterfly frames on location) to diffuse the sun for car shoots, group portraits and fashion. The larger the scrim relative to the subject, the softer the light. Typically loses 1 to 2 stops of light. On location you need a frame or a second assistant because of wind.